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Loans (Summary Of Impaired Loans) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded [1] $ 1,680 $ 2,219
Recorded Investment, With an allowance recorded [1] 3,021 6,381
Recorded Investment [1] 4,701 8,600
Unpaid Principal Balance, With no related allowance recorded [1] 2,615 2,954
Unpaid Principal Balance, With an allowance recorded [1] 3,021 6,381
Unpaid Principal Balance [1] 5,636 9,335
Related Allowance 891 2,171
Average Recorded Investment, With no related allowance recorded 1,875 1,474
Average Recorded Investment, With an allowance recorded 5,063 5,984
Average Recorded Investment 6,938 7,458
Interest Income Recognized, With no related allowance recorded  
Interest Income Recognized, With an allowance recorded
Interest Income Recognized
Commercial Business [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded [1] 1,155 1,635
Recorded Investment, With an allowance recorded [1] 1,183 3,853
Unpaid Principal Balance, With no related allowance recorded [1] 2,090 2,370
Unpaid Principal Balance, With an allowance recorded [1] 1,183 3,853
Related Allowance 431 2,056
Average Recorded Investment, With no related allowance recorded 1,307 853
Average Recorded Investment, With an allowance recorded 2,931 4,468
Interest Income Recognized, With no related allowance recorded  
Interest Income Recognized, With an allowance recorded
Commercial Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded [1] 525 584
Recorded Investment, With an allowance recorded [1] 1,838 2,528
Unpaid Principal Balance, With no related allowance recorded [1] 525 584
Unpaid Principal Balance, With an allowance recorded [1] 1,838 2,528
Related Allowance 460 115
Average Recorded Investment, With no related allowance recorded 568 621
Average Recorded Investment, With an allowance recorded 2,132 1,516
Interest Income Recognized, With no related allowance recorded  
Interest Income Recognized, With an allowance recorded
[1] Difference between recorded investment and unpaid principal balance represents partial charge-offs.